high
8.8
CWE
416
Advisory Published
Updated

CVE-2019-11757: Use After Free

First published: Tue Oct 22 2019(Updated: )

A use-after-free flaw was found in Mozilla Firefox and Thunderbird. When following a value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. An attacker could use this flaw to execute code that was stored in the referenced memory or crash the system.

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
redhat/firefox<0:68.2.0-4.el6_10
0:68.2.0-4.el6_10
redhat/thunderbird<0:68.2.0-2.el6_10
0:68.2.0-2.el6_10
redhat/firefox<0:68.2.0-1.el7_7
0:68.2.0-1.el7_7
redhat/thunderbird<0:68.2.0-1.el7_7
0:68.2.0-1.el7_7
redhat/firefox<0:68.2.0-2.el8_0
0:68.2.0-2.el8_0
redhat/thunderbird<0:68.2.0-1.el8_0
0:68.2.0-1.el8_0
redhat/firefox<68.2
68.2
redhat/thunderbird<68.2
68.2
Mozilla Thunderbird<68.2
68.2
Mozilla Firefox ESR<68.2
68.2
Mozilla Firefox<70
70
Mozilla Firefox<70.0
Mozilla Firefox ESR<68.2
Mozilla Thunderbird<68.2
Canonical Ubuntu Linux=16.04
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0+
70.0+
ubuntu/firefox<70.0
70.0
ubuntu/firefox<70.0+
70.0+
ubuntu/thunderbird<1:68.2.1+
1:68.2.1+
ubuntu/thunderbird<1:68.2.1+
1:68.2.1+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<1:68.2.0+
1:68.2.0+
ubuntu/thunderbird<68.2
68.2
ubuntu/thunderbird<1:68.7.0+
1:68.7.0+
debian/firefox
125.0.3-1
debian/firefox-esr
91.12.0esr-1~deb10u1
115.10.0esr-1~deb10u1
115.7.0esr-1~deb11u1
115.10.0esr-1~deb11u1
115.7.0esr-1~deb12u1
115.10.0esr-1~deb12u1
115.10.0esr-1
debian/thunderbird
1:91.12.0-1~deb10u1
1:115.10.1-1~deb10u1
1:115.7.0-1~deb11u1
1:115.10.1-1~deb11u1
1:115.7.0-1~deb12u1
1:115.10.1-1~deb12u1
1:115.10.1-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is vulnerability CVE-2019-11757?

    Vulnerability CVE-2019-11757 is a use-after-free flaw found in Mozilla Firefox and Thunderbird.

  • What is the severity of vulnerability CVE-2019-11757?

    The severity of vulnerability CVE-2019-11757 is high with a severity value of 8.8.

  • Which software is affected by vulnerability CVE-2019-11757?

    Vulnerability CVE-2019-11757 affects Mozilla Firefox and Thunderbird versions 68.2.0-4.el6_10, 68.2.0-2.el6_10, 68.2.0-1.el7_7, 68.2.0-1.el8_0, and Firefox ESR 68.2.

  • How can an attacker exploit vulnerability CVE-2019-11757?

    An attacker can exploit vulnerability CVE-2019-11757 to execute code stored in referenced memory or cause a crash.

  • Where can I find more information about vulnerability CVE-2019-11757?

    You can find more information about vulnerability CVE-2019-11757 in the following references: [Reference 1](https://bugzilla.mozilla.org/show_bug.cgi?id=1577107), [Reference 2](https://www.mozilla.org/en-US/security/advisories/mfsa2019-33/), [Reference 3](https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/).

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